Battery cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model provides a battery cover plate assembly, a battery, a battery pack and electric equipment, and relates to the technical field of batteries. The battery cover plate assembly comprises a cover plate body, a mounting seat and a sealing cover, wherein one end of the mounting seat is precisely positioned and fixed on the cover plate body, so that the through hole in the mounting seat is aligned with the open pore in the cover plate body, and the electrolyte is ensured to flow smoothly. And the sealing cover is fixed at the other end of the mounting seat so as to realize a good sealing effect. It can be understood that the installation base and the sealing cover are designed to be separated, the installation base and the cover plate body can be connected before electrolyte is injected, and it is avoided that due to the fact that the electrolyte is left on the cover plate body and crystallized, welding sealing operation is affected. The electrolyte is injected after the mounting seat is connected with the cover plate body, and the sealing cover and the mounting seat are fixedly sealed, so that the sealing performance and the reliability of the battery can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cover assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] With the continuous advancement of power battery technology and the increasing market demand, the performance of batteries in new energy battery vehicles is receiving more and more attention, and the energy density and safety of batteries have become important indicators for measuring battery performance.

[0003] Conventional steel-cased battery covers use a stamped groove design to allow for interference welding between the battery casing and the cover. During the electrolyte filling process, excess electrolyte can easily remain in the groove of the cover, causing electrolyte crystallization. When welding the filling hole caps later, the residual crystallized electrolyte can easily cause welding defects such as sparking, porosity, and cracks, resulting in the scrapping of the battery cell. Utility Model Content

[0004] This application provides a battery cover assembly, a battery, a battery pack, and an electrical device. The electrolyte injection hole on the battery cover assembly adopts a separate design of mounting base and sealing cover. Before injecting electrolyte, the mounting base is welded to the cover body. After the connection is completed, electrolyte is injected. By fixing and sealing the sealing cover to the mounting base, the welding defects such as explosion, pores, and cracks caused by residual crystallization of electrolyte are solved, which may cause the battery to be scrapped.

[0005] The embodiments of this application provide the following technical solutions to solve the above-mentioned technical problems:

[0006] In the first part, embodiments of this application provide a battery cover assembly, including:

[0007] A cover plate body having openings;

[0008] Mounting base, the mounting base is connected to the cover plate body, the mounting base has a through opening, and the through mask is disposed on the opening;

[0009] A sealing cap is attached to the side of the mounting base opposite to the cover plate body, and the sealing cap is used to seal the through port.

[0010] The beneficial effects of this application's embodiments: The battery cover assembly provided in this application includes a cover body, a mounting base, and a sealing cap. The cover body has an opening, the mounting base is connected to the cover body, and the mounting base has a through-hole, with a through-hole cover disposed on the opening. The sealing cap is connected to the side of the mounting base opposite to the cover body and is used to seal the through-hole. In this way, one end of the mounting base is precisely positioned and fixed to the cover body, ensuring that the through-hole on the mounting base aligns with the opening on the cover body, guaranteeing smooth electrolyte flow. The sealing cap is fixed to the other end of the mounting base to achieve a good sealing effect. It is understood that by adopting a separate design for the mounting base and sealing cap, the mounting base and cover body can be connected before electrolyte injection, avoiding electrolyte crystallization on the cover body that could affect the welding and sealing process. After connecting the mounting base and cover body, electrolyte is injected, and the sealing cap is fixed and sealed to the mounting base, improving the battery's sealing performance and reliability.

[0011] In one possible implementation, a mounting portion is also included, wherein the mounting base is positioned and connected to the cover plate body via the mounting portion;

[0012] The cover plate body has a stepped structure, and the opening is provided on the stepped structure.

[0013] In one possible implementation, the mounting portion is disposed on the side of the mounting base facing the cover plate body and protrudes toward the cover plate body.

[0014] In one possible implementation, the mounting portion is disposed on the side of the stepped structure facing the mounting base and protrudes toward the mounting base.

[0015] In one possible implementation, the maximum thickness of the mounting portion along the thickness direction of the cover plate body is a, and 0.2mm≤a≤0.5mm.

[0016] In one possible implementation, the mounting base includes a connecting portion and a base body. The connecting portion is disposed on the base body and extends along the outer circumference of the base body. The connecting portion is an annular structure continuously arranged around the central axis of the opening. One side of the connecting portion at least partially abuts against the cover plate body.

[0017] In one possible implementation, there is a gap between the outer peripheral surface of the mounting portion and the side of the cover plate body facing the opening, the gap forming a receiving cavity with the connecting portion of the mounting base and the stepped structure, the receiving cavity being used to receive solder, and the mounting base being brazed to the cover plate body;

[0018] Alternatively, the receiving cavity is used to receive adhesive, and the mounting base is bonded to the cover plate body.

[0019] In one possible implementation, the gap is an annular gap continuously arranged around the central axis of the opening.

[0020] In one possible implementation, the outer peripheral surface of the mounting portion abuts against the side of the cover plate body facing the opening, and the mounting base is welded to the cover plate body.

[0021] Alternatively, the outer peripheral surface of the mounting part is welded to the inner peripheral surface of the mounting base.

[0022] In one possible implementation, a first seal is also included, located between the sealing cap and the mounting base, to seal the through opening.

[0023] In one possible implementation, the first seal is located on the inner top wall of the sealing cover, and the sealing cover is detachably connected to the end of the mounting base opposite to the cover plate body.

[0024] In one possible implementation, the sealing cap is threaded to one end of the mounting base away from the cover plate body.

[0025] In one possible implementation, the sealing cap includes a cap body and a cap edge, the cap edge being disposed on the cap body and extending toward the mounting base.

[0026] In one possible implementation, the inner wall of the cover edge (540) is provided with threads, the height of the threads is h1 along the thickness direction of the cover body, the minimum distance between the farthest end of the mounting base away from the cover body and the connection part of the mounting base is h2, and h1 < h2.

[0027] In one possible implementation, h1 satisfies 1mm≤h1≤2mm, and / or h2 satisfies 3mm≤h2≤5mm.

[0028] In one possible implementation, a second seal is further included, which passes through both sides of the opening to seal the opening.

[0029] In one possible implementation, a third seal is also included, wherein the through-hole forms a receiving area with the cover plate body and the sealing cover, the third seal is located within the receiving area, and the sealing cover is threadedly connected to the end of the mounting base opposite to the cover plate body;

[0030] Alternatively, the sealing cover is connected to the end of the mounting base opposite to the cover plate body by a snap fastener.

[0031] In a possible implementation, a concave pattern structure is provided on a surface of the sealing cover facing away from the mounting base, and the concave pattern structure is a "one" shape or a "cross" shape structure.

[0032] Second part, an embodiment of the present application provides a battery, including:

[0033] A housing, which has a cavity inside;

[0034] At least one of the above-mentioned battery cover plate assemblies, and the cover plate body of the battery cover plate assembly is connected to at least one end of the housing;

[0035] A battery cell, which is located in the cavity of the housing, and at least one end of the battery cell is provided with a tab;

[0036] A pole column, which is arranged on the cover plate body, and at least one end of the tab is connected to the pole column.

[0037] Third part, an embodiment of the present application provides a battery pack, including:

[0038] The above-mentioned battery or the above-mentioned battery cover plate assembly.

[0039] Fourth part, an embodiment of the present application provides an electrical device, including:

[0040] An electrical device, and the above-mentioned battery pack or the above-mentioned battery, and the battery pack or the battery is used to provide electrical energy for the electrical device.

[0041] In addition to the technical problems solved by the present application, the technical features constituting the technical solution, and the beneficial effects brought by these technical features of the technical solution described above, other technical problems that can be solved by a battery cover plate assembly, a battery, a battery pack, and an electrical device provided by the present application, other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for describing the embodiments of the present application or the prior art. Obviously, the following drawings are only a part of the embodiments of the present application. These drawings and the text description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0043] Figure 1An exploded view of a battery provided in an embodiment of this application;

[0044] Figure 2 A cross-sectional view of a battery provided in an embodiment of this application;

[0045] Figure 3 An exploded view of a battery cover assembly provided in an embodiment of this application;

[0046] Figure 4 A cross-sectional view of a battery cover assembly provided in an embodiment of this application;

[0047] Figure 5 This is a schematic diagram showing the dimensions of a battery cover assembly provided in an embodiment of this application;

[0048] Figure 6 A cross-sectional view of another battery cover assembly provided in an embodiment of this application;

[0049] Figure 7 A cross-sectional view of another battery cover assembly provided in an embodiment of this application;

[0050] Figure 8 A cross-sectional view of a battery cover assembly provided for an embodiment of this application;

[0051] Figure 9 This is a cross-sectional view of another battery cover assembly provided in an embodiment of this application.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100 - Outer shell; 110 - Cavity; 120 - Terminal post;

[0054] 200-Battery cover assembly;

[0055] 300 - Cover plate body; 310 - Stepped structure; 320 - Opening;

[0056] 400 - Mounting base; 410 - Mounting part; 420 - Connecting part; 430 - Base body; 440 - Through port; 450 - Thread;

[0057] 500 - Sealing cap; 510 - Corrugated structure; 520 - First seal; 530 - Cap body; 540 - Cap edge;

[0058] 600 - Second seal;

[0059] 700 - Third seal; 710 - Reception area;

[0060] 800 - Solder;

[0061] 900 - Adhesive. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0063] This application provides an electrical device, which includes an electrical component and a battery pack or battery that provides electrical energy to the electrical component. For example, the electrical device can be a vehicle or an energy storage device. When the electrical device is a vehicle, the vehicle can be an electric vehicle, a gasoline vehicle, or a hybrid vehicle. The electrical component can be an electric motor, a control system, a lighting system, etc. When the electrical device is an energy storage device, the electrical component can be an inverter, a controller, etc. The battery pack can include multiple batteries, and these batteries are connected in a certain way and controlled by a control system to store and output electrical energy. The battery pack or battery provides electrical energy to the electrical device to meet the normal operation of the device.

[0064] This application provides a battery including a casing 100, at least one battery cover assembly 200, a battery core, and a terminal post 120. The casing 100 has an interior cavity 110, and the cover body 300 of the battery cover assembly 200 is connected to at least one end of the casing 100. The battery core is located within the cavity 110 of the casing 100, and at least one end of the battery core has a tab. The terminal post 120 is disposed on the cover body 300, and at least one end of the terminal post 120 is connected to the tab.

[0065] This application provides a battery cover assembly 200, such as... Figure 1 , Figure 2 and Figure 3 As shown, the battery cover assembly 200 includes a cover body 300, a mounting base 400, and a sealing cover 500. The cover body 300 has an opening 320. The mounting base 400 is connected to the cover body 300 and has a through-hole 440 covering the opening 320. The sealing cover 500 is connected to the side of the mounting base 400 opposite to the cover body 300, and the sealing cover 500 seals the through-hole 440.

[0066] Understandably, one end of the mounting base 400 is precisely positioned and fixed to the cover plate body 300, ensuring that the through-hole 440 on the mounting base 400 aligns with the opening 320 on the cover plate body 300, thus guaranteeing smooth electrolyte flow. The sealing cap 500 is fixed to the other end of the mounting base 400 to achieve a good sealing effect. After connecting the mounting base 400 and the cover plate body 300, electrolyte is injected, and the sealing cap 500 is fixed and sealed to the mounting base 400, improving the battery's sealing performance and reliability.

[0067] This application provides a battery cover assembly 200, such as... Figure 1 , Figure 2 and Figure 3 As shown, it also includes a mounting part 410, and the mounting base 400 is positioned and connected to the cover plate body 300 through the mounting part 410. The plate body 300 has a stepped structure 310, and an opening 320 is provided on the stepped structure 310.

[0068] The stepped structure 310 on the cover plate body 300 can be stamped. The stepped structure 310 can be used to position the mounting base 400, ensure the tightness of the connection between the mounting base 400 and the stepped structure 310, and also reduce the weight of the cover plate body 300. In this application example, the cover plate body 300 can be an ultra-thin steel shell, but it is not limited to steel shells; for example, it can also be made of other materials such as aluminum alloy. An opening 320 is provided on the stepped structure 310 of the cover plate body 300. The opening 320 is connected to the cavity 110 of the outer shell 100. Electrolyte can be injected into the cavity 110 of the outer shell 100 through the opening 320 to ensure the activation of the electrode core.

[0069] In one possible implementation, such as Figures 4 to 7 As shown, the mounting part 410 is disposed on the side of the mounting base 400 facing the cover plate body 300 and protrudes towards the cover plate body 300. The first end of the mounting base 400 has the mounting part 410, which protrudes towards the cover plate body 300. The mounting part 410 cooperates with the stepped structure 310 to achieve positioning connection. The mounting base 400 is also provided with a through opening 440, which corresponds to the opening 320 on the cover plate body 300 and covers the opening 320, ensuring that the electrolyte enters the cavity 110 of the outer casing 100 sequentially through the through opening 440 and the opening 320. It can be understood that the size of the through opening 440 is larger than that of the opening 320, which can provide sufficient space for the flow of electrolyte and avoid the battery performance degradation caused by poor electrolyte flow.

[0070] The second end of the mounting base 400 has a sealing cap 500, which seals the through-hole 440 to prevent electrolyte leakage and external contaminants from entering the cavity 110 and damaging the electrode core. The tight fit between the sealing cap 500 and the mounting base 400 achieves a good sealing effect. For example, a threaded connection, a snap-fit ​​connection, a compression seal, or other sealing methods can be used to ensure sealing performance. It should be noted that the first end of the mounting base 400 is the side facing the cover plate body 300, and the second end of the mounting base 400 is the side facing away from the cover plate body 300, but it is not limited to the above configuration.

[0071] In another possible implementation, such as Figure 8 and Figure 9 As shown, the mounting part 410 is provided on the side of the stepped structure 310 facing the mounting base 400 and protrudes towards the mounting base 400. The mounting part 410 is used for positioning so that the mounting base 400 is connected to the cover plate body 300, which will not be described in detail here.

[0072] The injection hole on the cover plate body 300 is separated from the sealing cover 500 by the mounting base 400. The mounting base 400 is positioned by the stepped structure 310 on the cover plate body 300 to prevent displacement between the mounting base 400 and the cover plate body 300 during welding, which would cause misalignment between the through-hole 440 and the opening 320, preventing the electrolyte from being smoothly injected into the cavity 110 of the outer shell 100. It is understood that the welding operation between the mounting base 400 and the cover plate body 300 is performed before the electrolyte injection. At this time, no electrolyte injection is performed, which can avoid welding defects that may be caused by residual electrolyte crystallization in the stepped structure 310.

[0073] In addition to the sealing cap 500, a first sealing element 520, a second sealing element 600, and a third sealing element 700 can be provided to further seal the injection hole. The first sealing element 520 enhances the sealing effect of the sealing cap 500 on the second end of the mounting base 400; the second sealing element 600 seals the opening 320 in the body of the cap 500 plate; and the third sealing element 700 seals the through opening 440 in the mounting base 400. The first sealing element 520, the second sealing element 600, and the third sealing element 700 are described in detail below.

[0074] In some embodiments of this application, such as Figures 3 to 7 As shown, the mounting base 400 includes a connecting part 420 and a base body 430. The connecting part 420 is disposed on the base body 430 and extends along the outer periphery of the base body 430. The connecting part 420 is an annular structure continuously arranged around the central axis of the opening 320. One side of the connecting part 420 at least partially abuts against the cover plate body 300.

[0075] A connecting portion 420 is provided circumferentially on the base body 430. One side of the connecting portion 420 at least partially abuts against the cover body 300, ensuring tight contact between the mounting base 400 and the side of the cover body 300 facing away from the outer casing 100, and ensuring the tightness of the weld. The connecting portion 420 enhances the structural stability between the mounting base 400 and the cover body 300. When the battery is subjected to external impact or vibration, the connecting portion 420 can effectively disperse and absorb these forces, protecting the battery's internal structure from damage. Exemplarily, the connecting portion 420 and the cover body 300 can be connected by ordinary welding or brazing; there is no limitation here, and adjustments can be made according to actual working conditions.

[0076] In some embodiments of this application, combined with Figure 4 and Figure 5 As shown, along the thickness direction of the cover plate body 300, the maximum thickness of the mounting portion 410 is 'a', and 0.2mm ≤ a ≤ 0.5mm. For example, 'a' can be 0.2mm, 0.35mm, 0.5mm, etc., and is not limited here. In this embodiment, for ease of description, the thickness direction of the cover plate body 300 is defined as the Z direction, for example, it can be the first direction, and the width direction of the cover plate body 300 is defined as the X direction, for example, it can be the second direction. It should be noted that the first direction and the second direction can be the same or different. In this embodiment, the example is given where the first direction and the second direction are different (e.g., the first direction is perpendicular to the second direction). In some examples, the first direction and the second direction can also be the same.

[0077] It should be noted that the maximum thickness of the mounting section 410 and the distance between the top surface of the stepped structure 310 and the top surface of the cover plate body 300 are both 'a'. Understandably, if 'a' is too large, the stepped structure 310 of the cover plate body 300 may be too thin, reducing the structural strength of the cover plate body 300 and hindering welding. If 'a' is too small, the positioning and welding effects may be poor, which is detrimental to the stability of the connection.

[0078] Along the width direction of the cover body 300, the maximum width of the connecting portion 420 is r1, and 9mm ≤ r1 ≤ 13mm. For example, r1 can be 9mm, 11.5mm, 13mm, etc., without limitation. It should be noted that the maximum width of the connecting portion 420 should be greater than the maximum size of the through opening 440. It is understood that the connecting portion 420 abuts against the top surface of the cover body 300 to ensure a tight connection between the two. Sufficient contact area can enhance the stability and durability of the connection between the connecting portion 420 and the cover body 300. However, r1 cannot be too large, as this will increase the weight of the battery, occupy space, and is not conducive to the miniaturization design of the battery.

[0079] Along the width direction of the cover plate body 300, the maximum width of the mounting base 400 and the maximum width of the mounting part 410 are both r2, and 5mm≤r2≤8mm. For example, r2 can be 5mm, 6.5mm, 8mm, etc., without limitation. That is to say, the mounting base 400 and the mounting part 410 are of equal width, which can reduce the structural manufacturing and assembly difficulty of the mounting base 400, ensure that the mounting base 400 and the mounting part 410 have sufficient strength, and reduce the volume and weight of the mounting base 400 and the mounting part 410. It can be understood that r1 is greater than r2 to ensure the stability of the connection between the mounting part 410 and the step structure 310.

[0080] In one possible implementation, such as Figure 4 and Figure 5 As shown, there is a gap between the outer peripheral surface of the mounting base 400 and the side of the cover plate body 300 facing the opening 320. The gap is an annular gap continuously arranged around the central axis of the opening 320. The gap, the connecting part 420 of the mounting base 400, and the stepped structure 310 form a receiving cavity, which is used to receive solder 800. The mounting base 400 is brazed to the cover plate body 300. Alternatively, the receiving cavity is used to receive adhesive 900, and the mounting base 400 is bonded to the cover plate body 300.

[0081] Understandably, the cavity between the stepped structure 310 and the connecting part 420 allows the solder 800 to flow and fill the gap during heating, ensuring a firm and reliable connection between the mounting base 400 and the cover plate body 300. After the mounting base 400 and the cover plate body 300 are connected by brazing, electrolyte is injected into the cavity of the outer shell 100. Even if the electrolyte overflows through the opening 320, the electrolyte remains within the stepped structure 310. In other words, the electrolyte overflow is within the accommodating area 710. When the sealing cap 500 is subsequently sealed to the second end of the mounting base 400 using a threaded 450 or a snap-on cap, welding defects such as sparks, pores, and cracks will not occur, thus preventing the battery cell from being scrapped.

[0082] Please continue reading. Figure 5 Along the width direction of the cover plate body 300, the minimum width of the gap is L, and 0mm≤L≤1mm. For example, L can be 0.2mm, 0.6mm, 1mm, etc., and there is no restriction here. It should be noted that in order to ensure the fluidity of the solder 800 after heating in the receiving cavity, the flow effect is better when 0.5mm≤L≤1mm. The material of the solder 800 is not restricted here. Hard solder or soft solder can be used, and it can be adapted to the needs of actual working conditions.

[0083] In one possible implementation, such as Figure 6As shown, the outer peripheral surface of the mounting base 400 abuts against the side of the cover plate body 300 facing the opening 320, and the mounting base 400 is welded to the cover plate body 300. That is, when the gap L is 0, the outer peripheral surface of the mounting part 410 of the mounting base 400 is tightly fitted to the side of the cover plate body 300 facing the opening, and is connected by welding to prevent loosening or leakage, reduce maintenance costs, and improve the reliability of the structure. In other words, the outer peripheral surface of the mounting part 410 is directly welded to the inner peripheral surface of the mounting base 400.

[0084] In some embodiments of this application, such as Figures 4 to 7 As shown, the battery cover assembly 200 includes a first seal 520 located between the sealing cover 500 and the mounting base 400 to seal the through opening 440. The first seal 520 is located on the inner top wall of the sealing cover 500, and the sealing cover 500 is detachably connected to the second end of the mounting base 400. For example, the sealing cover 500 is threaded 450 to the end of the mounting base 400 opposite to the cover body 300.

[0085] The first sealing element 520 is located on the inner top wall of the sealing cover 500, and the sealing cover 500 is threadedly connected to the second end of the mounting base 400 via a thread 450. The first sealing element 520 can be made of an elastic material, such as rubber or silicone, to ensure that the first elastic element can deform under pressure, thereby tightly fitting the inner top wall of the sealing cover 500 and the second end of the mounting base 400. It is understood that the inner side wall of the sealing cover 500 is provided with a thread 450 that matches the second end of the mounting base 400. The sealing cover 500 and the second end of the mounting base 400 are connected via the thread 450, and the mounting base 400 can be installed or removed by rotating the sealing cover 500.

[0086] In some embodiments of this application, the sealing cap 500 includes a cap body 530 and a cap edge 540, the cap edge 540 being disposed on the cap body 530 and extending toward the mounting base 400. For example... Figure 5 As shown, along the thickness direction of the cover body 300, the inner wall of the cover edge 540 of the sealing cover 500 is provided with a thread 450, the thickness of which is h1. The minimum distance between the farthest end of the mounting base 400 away from the cover body 300 and the connection portion 420 of the mounting base 400 is h2, and h1 < h2. It can be understood that when h1 is less than h2, the thread 450 on the sealing cover 500 can be completely screwed into the corresponding thread 450 on the inner wall of the mounting base 400, forming a tight connection. At the same time, since h1 is less than h2, it can also be ensured that the first sealing element 520 can be squeezed by the sealing cover 500 and the second end of the mounting base 400, further enhancing the sealing effect.

[0087] Wherein, h1 satisfies 1mm≤h1≤2mm, for example, h1 can be 1.2mm, 1.6mm, 2mm, etc., without restriction here. h2 satisfies 3mm≤h2≤5mm, for example, h2 can be 3.2mm, 4.6mm, 5mm, etc., without restriction here. The specific dimensions of h1 and h2 can be adaptively adjusted according to the actual working conditions.

[0088] It is understandable that in both the first and second possible implementation methods described above, the cross-sections of the mounting base 400 and the sealing cover 500 are circular to ensure that the second end of the mounting base 400 and the sealing cover 500 are threaded together.

[0089] In some embodiments of this application, a second sealing element 600 and a third sealing element 700 are also included. The second sealing element 600 passes through both sides of the opening 320 to seal the opening 320. The through opening 440, the cover plate body 300, and the sealing cover 500 form a receiving area 710. The third sealing element 700 is located within the receiving area 710. The sealing cover 500 is connected to the second end of the mounting base 400 by a thread 450. Alternatively, the sealing cover 500 is connected to the second end of the mounting base 400 by a snap-fit ​​connection.

[0090] In one possible implementation, such as Figure 7 As shown, the battery cover assembly 200 also includes a third seal 700. The through-hole 440 of the mounting base 400, the cover body 300, and the sealing cover 500 form a receiving area 710. The third seal 700 is located within the receiving area 710, and the sealing cover 500 is threadedly connected to the second end of the mounting base 400 via a thread 450. Alternatively, the sealing cover 500 is snap-fitted to the second end of the mounting base 400. It is understood that by pressing to achieve a snap-fit ​​connection between the sealing cover 500 and the mounting base 400, the compression effect on the first seal 520 is less than the compression force experienced by a threaded connection.

[0091] Understandably, when electrolyte is injected into the cavity 110 of the housing 100, the opening 320 can be sealed by the second seal 600. Furthermore, adhesive is injected into the receiving area 710 to form a third seal 700, improving the sealing effect. At this point, a snap-fit ​​connection can be used to ensure a tight connection between the sealing cover 500 and the mounting base 400. The cross-sections of the mounting base 400 and the sealing cover 500 can be circular, but are not limited to circular; for example, they can also be rectangular or other shapes.

[0092] In some embodiments of this application, the sealing cover 500 has a textured structure 510 on the side facing away from the mounting base 400, which connects the sealing cover 500 to the mounting base 400. The textured structure 510 can be in the shape of an "I" or a cross. Alternatively, the sealing cover 500 can be provided with other textured structures 510 on the side facing away from the mounting base 400, such as a triangular, square, or hexagonal outer wall. The specific shape of the textured structure 510 is not limited here and can be adapted according to actual working conditions.

[0093] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0094] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0095] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cover assembly, characterized in that, include: A cover plate body (300) having an opening (320); Mounting base (400), the mounting base (400) is connected to the cover plate body (300), the mounting base (400) has a through opening (440), and the through opening (440) covers the opening (320); A sealing cap (500) is attached to the mounting base (400) on the side opposite to the cover plate body (300) and is used to seal the through port (440).

2. The battery cover assembly according to claim 1, characterized in that, It also includes a mounting part (410), and the mounting base (400) is positioned and connected to the cover plate body (300) through the mounting part (410); The cover plate body (300) has a stepped structure (310), and the opening (320) is provided on the stepped structure (310).

3. The battery cover assembly according to claim 2, characterized in that, The mounting part (410) is disposed on the side of the mounting base (400) facing the cover plate body (300) and protrudes towards the cover plate body (300).

4. The battery cover assembly according to claim 2, characterized in that, The mounting part (410) is disposed on the side of the stepped structure (310) facing the mounting base (400) and protrudes towards the mounting base (400).

5. The battery cover assembly according to any one of claims 2-4, characterized in that, Along the thickness direction of the cover plate body (300), the maximum thickness of the mounting part (410) is a, and 0.2mm≤a≤0.5mm.

6. The battery cover assembly according to any one of claims 1-4, characterized in that, The mounting base (400) includes a connecting part (420) and a base body (430). The connecting part (420) is disposed on the base body (430) and extends along the outer periphery of the base body (430). The connecting part (420) is an annular structure continuously arranged around the central axis of the opening (320). One side of the connecting part (420) at least partially abuts against the cover plate body (300).

7. The battery cover assembly according to claim 3 or 4, characterized in that, There is a gap between the outer peripheral surface of the mounting part (410) and the side of the cover plate body (300) facing the opening (320). The gap, the connecting part (420) of the mounting base (400), and the stepped structure (310) form a receiving cavity. The receiving cavity is used to receive solder (800). The mounting base (400) is brazed to the cover plate body (300). Alternatively, the receiving cavity is used to receive adhesive (900), and the mounting base (400) is bonded to the cover plate body (300).

8. The battery cover assembly according to claim 7, characterized in that, The gap is an annular gap continuously arranged around the central axis of the opening (320).

9. The battery cover assembly according to claim 3 or 4, characterized in that, The outer peripheral surface of the mounting part (410) abuts against the side of the cover plate body (300) facing the opening (320), and the mounting base (400) is welded to the cover plate body (300); Alternatively, the outer peripheral surface of the mounting part (410) may be welded to the inner peripheral surface of the mounting base (400).

10. The battery cover assembly according to claim 1, characterized in that, It also includes a first seal (520) located between the sealing cap (500) and the mounting base (400) to seal the through port (440).

11. The battery cover assembly according to claim 10, characterized in that, The first seal (520) is located on the inner top wall of the seal cover (500), and the seal cover (500) is detachably connected to one end of the mounting base (400)背离 the cover plate body (300).

12. The battery cover assembly according to claim 11, characterized in that, The seal cover (500) is threadedly connected to one end of the mounting base (400)背离 the cover plate body (300).

13. The battery cover assembly according to claim 1, characterized in that, The seal cover (500) includes a cap body (530) and a cover edge (540). The cover edge (540) is provided on the cap body (530) and extends towards the mounting base (400).

14. The battery cover assembly according to claim 13, characterized in that, Threads (450) are provided on the inner wall of the cover edge (540). Along the thickness direction of the cover plate body (300), the height of the threads (450) is h1, and the minimum distance between the farthest end of the mounting base (400)背离 the cover plate body (300) and the connecting portion (420) of the mounting base (400) is h2, and h1 < h2.

15. The battery cover assembly according to claim 14, characterized in that, The h1 satisfies 1mm ≤ h1 ≤ 2mm, and / or, the h2 satisfies 3mm ≤ h2 ≤ 5mm.

16. The battery cover assembly according to claim 1, characterized in that, It further includes a second seal (600). The second seal (600) passes through both sides of the opening (320) to seal the opening (320).

17. The battery cover assembly according to claim 16, characterized in that, It further includes a third seal (700). The through hole (440), the cover plate body (300), and the seal cover (500) form an accommodation area (710). The third seal (700) is located in the accommodation area (710). The seal cover (500) is connected to one end of the mounting base (400)背离 the cover plate body (300) through the threads (450); Alternatively, the seal cover (500) is connected to one end of the mounting base (400)背离 the cover plate body (300) through a buckle.

18. The battery cover assembly according to claim 1, characterized in that, A concave pattern structure (510) is provided on the surface of the seal cover (500)背向 the mounting base (400). The concave pattern structure (510) is in a "one" - shaped or "cross" - shaped structure.

19. A battery, characterized in that, It includes: A housing (100) having a cavity (110) inside; At least one battery cover assembly (200) according to any one of the above claims 1 - 18. The cover plate body (300) of the battery cover assembly (200) is connected to at least one end of the housing (100); A battery cell located in the cavity (110) of the housing (100), and at least one end of the battery cell is provided with a tab; A pole column (120) provided on the cover plate body (300), and at least one tab at one end is connected to the pole column (120).

20. A battery pack, characterized in that, It includes: The battery according to claim 19 above or the battery cover assembly according to any one of claims 1 - 18.

21. An electrical appliance, characterized in that, It includes: An electrical device, and the battery pack according to claim 20 above or the battery according to claim 19. The battery pack or the battery is used to provide electrical energy to the electrical device.

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